Submerged lifting pump for deep wells



H. SAUVEUR SUBMERGED LFTING PUMP FOR DEEP WELLS Filed Oct. 7, 1926 May 21, 1929.

Patented vay 21, `1929.

UNITED STATES PATENT or-'l=lcE.`

HARRY SAUVEUR) F BERLIN, GERMANY.

sunmnnenn LIFTING PUMP non. DEEP WELLSh Application led Dctober 7, 1926, Serial No. 140,097; and Vin Germany October 5, 1925.

. into the motor gas under pressure and regu;f late the pressure in the motor to a given value in excess of the varying hydrostatic pressure under which the pump is submerged. The gas may be taken from a supply of compressed gas above ground.

2o The pressure in the motor can be regulated by various means, and in a preferred embodimentl I provide a regulator influenced on one side by the pressure within the machine casing and on the other side by the pressure of the liquid in the well surrounding the casin and an adjustable additional load so that t eregulator stands in its norv mal osition if the pressure within the casing is in balance with the pressure on the Y out-side of the casing andthe pressure of the additional load. Therefore this additional load corresponds to 'thedesired surplus of pressure of the gas in the casing over the pressure of the liquid surrounding the casing. This additional load may be brought about by an adjustable spring.

A regulator operating on this principle may be adapted to connect'a gas supply under pressure with the motor as required to maintain the pressure therein within the limits defined above.

Any gas may be utilized which is of such 'a character as not to exert detrimental action on the parts of the motor, or on .the gas or liquid in the well, or to involve danger o explosion. t

In the drawings affixed tov this specication, a pump embodying my invention is ily lustrated diagrammatically by way of example.

Figure 1 is a dia ammatic elevation showing a plant in which a centrifugal pump is arranged below the motor, and gas is supplied from a supply of pressure above ground, and

Fig. 2 is a section of a regulator for the plant of Fig. 1, on a larger scale.

Referring'now to the drawings, and first toFig. 1, 45 is a well or shaft, for instance, an 011 well, and l is the delivery pipe from which the pump and motor unit is suspended. The unit is constituted by the motor 2 and the pump 5. In the present instance, the motor is arranged abovethe pump. 2 is the shaft of the motor 2 which extends downwards through stuing boxes 3 and iinparts rotation to the pump 5 through a clutch 4. The pump may be of any suitable type and is here shown as a centrifugal pump. The pump draws oil from the well as indicated by the arrow 6 and discharges it into the delivery pipe as indicated by the arrows 6. 7 is a check valve in the delivery pipe 1. The liquid level in the well 45 issub- )ected to considerable variations and an automatic regulator 17 is provided for regulating the gas ressure in the motor in conformity with t e liquid head. The regulator is shown on a larger scale in Fig. 2. 18 is a pipe through which oil from the well 45 is admitted to the inside of the 'regulator 17 and 20 is a diaphragm which closes the under chamber of the regulator at the top.

19 isa spring interposed between an up er and lower washer 19. The upper wa er engages the diaphragm 20 and the lower is supported by a set screw 19" in the bottom of the casing 17. The spring 19 is set for the desired pressure gradient before the pump is lowered into the well. The gas pressure in the casing acts on a iston 22 on the top of the diaphragm 20. 3 is a cham ber above the regulator casin 17 to which gas under pressure is supplie from a compressor or the like, not shown, through a pipe 37. 47 is a spindle on the piston 22, and 46 is a valve on the-end of the spindle which controls an opening in the bottom of the chamber 37. 46 are ports in the Wall of the regulator casing through which gas from the chamber 37 is discharged into the motor 2 when the valve 46 opens which will. occur when the pressure in the well in creases due to the rising of the liquid level therein. The valve remains open until the gas pressure above the diaphragm 20 corre' sponds to the increased pressure in the casinv andthe tension of spring 19 and closes wen equilibrium has een reestablished.

maintain in given surplus 'over the changing pressure m the fluid or material surrounding the casing. In testimony whereof I'liave axe'd my signature. Y

ing theV within the casing to asing thegas'pressure st a 10 'b HARRY SAUVEUR-.4v t 

